/*
 * Alloy Analyzer
 * Copyright (c) 2002 Massachusetts Institute of Technology
 *
 * The Alloy Analyzer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The Alloy Analyzer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Alloy Analyzer; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package alloy.ast;


public interface MultiplicityExpr extends Node, HasType {

    /** gets the set multiplicity of this
     * e.g. if this is one (A lone->lone B), then
     * we return one. **/
    public Multiplicity getMult();

    /** sets the set multiplicity of this to mult_ **/
    public void setMult(Multiplicity mult_);

    /**
     * convert to an Expr
     */
    public Expr toExpr();

    /**
     * Compare to another {@link MultiplicityExpr}.  Overriding {@link #equals}
     * would have consequences beyond what we need here, so instead we define
     * our own method for comparing {@link MultiplicityExpr}s, with the same
     * semantics as {@link #equals}.
     */
    public boolean isSameAs(MultiplicityExpr otherMult_);

}
